整理命名空间 (#1409)

* feat: remove using namespace mediakit in header files.

(cherry picked from commit d44aeb339a8a0e1f0455be82b21fe4b1b536299f)

* feat: remove using namespace mediakit in FFmpegSource.h

* feat: remove using namespace mediakit in RtpExt.h

* feat: remove using namespace mediakit in header files.

* feat: remove using namespace std in header files.

* feat: remove using namespace std in header files when zltoolkit remove std in header

* 补充命名空间

* 整理命名空间

* 整理命名空间2

* 修复macos ci

* 修复编译问题

* 修复编译问题2

* 修复编译问题3

Co-authored-by: Johnny <hellojinqiang@gmail.com>
Co-authored-by: Xiaofeng Wang <wasphin@gmail.com>

src/Record/MP4Muxer.h

@@ -72,7 +72,7 @@ private:
         int track_id = -1;
         Stamp stamp;
     };
-    unordered_map<int, track_info> _codec_to_trackid;
+    std::unordered_map<int, track_info> _codec_to_trackid;
     FrameMerger _frame_merger{FrameMerger::mp4_nal_size};
 };
 
@@ -92,7 +92,7 @@ public:
      * 打开mp4
      * @param file 文件完整路径
      */
-    void openMP4(const string &file);
+    void openMP4(const std::string &file);
 
     /**
      * 手动关闭文件(对象析构时会自动关闭)
@@ -103,7 +103,7 @@ protected:
     MP4FileIO::Writer createWriter() override;
 
 private:
-    string _file_name;
+    std::string _file_name;
     MP4FileDisk::Ptr _mp4_file;
 };
 
@@ -125,23 +125,23 @@ public:
     /**
      * 获取fmp4 init segment
      */
-    const string &getInitSegment();
+    const std::string &getInitSegment();
 
 protected:
     /**
      * 输出fmp4切片回调函数
-     * @param string 切片内容
+     * @param std::string 切片内容
      * @param stamp 切片末尾时间戳
      * @param key_frame 是否有关键帧
      */
-    virtual void onSegmentData(string string, uint32_t stamp, bool key_frame) = 0;
+    virtual void onSegmentData(std::string string, uint32_t stamp, bool key_frame) = 0;
 
 protected:
     MP4FileIO::Writer createWriter() override;
 
 private:
     bool _key_frame = false;
-    string _init_segment;
+    std::string _init_segment;
     MP4FileMemory::Ptr _memory_file;
 };